body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-color: #000;
}

h1 {
  --progress: 0;
  
  color: transparent;
  width: 420px;
  margin: 0 auto;
  font-size: 60px;
  font-family: Helvetica;
  letter-spacing: -3px;
  background-image: linear-gradient(#fff calc(100% - calc(var(--progress) * 100%)), #4cd265 calc(100% - calc(var(--progress) * 100%)));
  background-clip: text;
  -webkit-background-clip: text;
  
  transform: scale(clamp(1, calc((var(--progress) - 0.99) * 200), 1.3));
  transition: .3s transform ease-out;
}

.buttons {
  position: absolute;
  bottom: 0;
  padding: 20px;
}

.buttons button {
  display: inline-block;
  font-size: 32px;
  background-color: #fff;
  border: 0;
  padding: 10px 20px;
  border-radius: 12px;
  margin: 0 10px;
}